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@angular/forms
Advanced tools
Package description
The @angular/forms package is a part of the Angular framework that provides tools for creating and managing forms in Angular applications. It offers two approaches: Reactive Forms and Template-driven Forms, which allow developers to handle user input and form validation in a robust and scalable way.
Reactive Forms
Reactive Forms provide a model-driven approach to handling form inputs whose values change over time. This feature allows for more flexible, scalable, and testable forms.
import { ReactiveFormsModule } from '@angular/forms';
@NgModule({
imports: [
// other imports ...
ReactiveFormsModule
],
})
export class AppModule { }
Template-driven Forms
Template-driven Forms are useful for adding simple forms to your app with minimal setup. They are less flexible than Reactive Forms but can be easier to use for basic scenarios.
import { FormsModule } from '@angular/forms';
@NgModule({
imports: [
// other imports ...
FormsModule
],
})
export class AppModule { }
Form Validation
The package provides built-in validators as well as the ability to create custom validators, making it easy to implement complex validation logic for form fields.
import { FormControl } from '@angular/forms';
let email = new FormControl('', [Validators.required, Validators.email]);
Form Groups
Form Groups are used to group together multiple form controls into one object, allowing for easier management of form data and validation.
import { FormGroup, FormControl } from '@angular/forms';
let userForm = new FormGroup({
firstName: new FormControl(),
lastName: new FormControl(),
age: new FormControl()
});
React Hook Form is a library for React that enables the management of forms with minimal re-renders. It is similar to @angular/forms in providing form validation and form state management, but it is designed specifically for React and uses hooks.
Formik is another popular form library for React. It simplifies the process of building, validating, and handling forms. It is comparable to @angular/forms in its functionality but is tailored to the React ecosystem.
Redux Form leverages Redux for form state management in React applications. It is similar to @angular/forms in that it handles form state and validation, but it integrates tightly with Redux for state management.
Changelog
18.0.0-next.0 (2024-03-14)
OnPush
views at the root of the application need to
be marked dirty for their host bindings to refresh. Previously, the host
bindings were refreshed for all root views without respecting the
OnPush
change detection strategy.ComponentFixture
autoDetect
feature will no
longer refresh the component's host view when the component is OnPush
and not marked dirty. This exposes existing issues in components which
claim to be OnPush
but do not correctly call markForCheck
when they
need to be refreshed. If this change causes test failures, the easiest
fix is to change the component to ChangeDetectionStrategy.Default
.ApplicationRef
that are still marked for
check after one round completes. In rare cases, this can result in infinite
loops when certain patterns continue to mark views for check using
ChangeDetectorRef.detectChanges
. This will be surfaced as a runtime
error with the NG0103
code.ComponentFixture.autoDetect
feature now executes
change detection for the fixture within ApplicationRef.tick
. This more
closely matches the behavior of how a component would refresh in
production. The order of component refresh in tests may be slightly
affected as a result, especially when dealing with additional components
attached to the application, such as dialogs. Tests sensitive to this
type of change (such as screenshot tests) may need to be updated.
Concretely, this change means that the component will refresh before
additional views attached to ApplicationRef
(i.e. dialog components).
Prior to this change, the fixture component would refresh after other
views attached to the application.NgZone
is now the first of either
setTimeout
or requestAnimationFrame
. Code which relies on this
timing (usually by accident) will need to be adjusted. If a callback
needs to execute after change detection, we recommend afterNextRender
instead of something like setTimeout
.ExpressionChangedAfterItHasBeenCheckedError
or not be refreshed until
some future round of change detection. In rare circumstances, this
correction can cause issues. We identified one instance that relied on
the previous behavior by reading a value on initialization which was
queued to be updated in a microtask instead of being available in the
current change detection round. The component only read this value during
initialization and did not read it again after the microtask updated it.RedirectCommand
for redirects
in addition to UrlTree
. Code which expects only boolean
or UrlTree
values in Route
types will need to be adjusted.| Commit | Type | Description | | -- | -- | -- | | 9b424d7224 | fix | preserve original reference to non-deferrable dependency (#54759) |
| Commit | Type | Description |
| -- | -- | -- |
| 64f870c12b | fix | ApplicationRef.tick
should respect OnPush for host bindings (#53718) (#53718) |
| 8cad4e8cbe | fix | ComponentFixture
autoDetect
respects OnPush
flag of host view (#54824) |
| ba8e465974 | fix | Change Detection will continue to refresh views while marked for check (#54734) |
| 24bc0ed4f2 | fix | ComponentFixture autodetect should detect changes within ApplicationRef.tick (#54733) |
| 10c5cdb49c | fix | ensure change detection runs in a reasonable timeframe with zone coalescing (#54578) |
| ad045efd4b | fix | Ensure views marked for check are refreshed during change detection (#54735) |
| 700c0520bb | fix | Update ApplicationRef.tick loop to only throw in dev mode (#54848) |
| Commit | Type | Description |
| -- | -- | -- |
| 8735af08b9 | feat | Add ability to return UrlTree
with NavigationBehaviorOptions
from guards (#45023) |
<a name="17.3.0"></a>
Readme
The sources for this package are in the main Angular repo. Please file issues and pull requests against that repo.
Usage information and reference details can be found in Angular documentation.
License: MIT
FAQs
Angular - directives and services for creating forms
The npm package @angular/forms receives a total of 2,227,523 weekly downloads. As such, @angular/forms popularity was classified as popular.
We found that @angular/forms demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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